阅读理解。 Do you remember your dreams? Do people have the same dream? Why do we dream? There are many questions about dreams. We dream during the REM (rapid eye movement 眼球快速移动) stage of sleep. We have about five periods of REM sleep during the night. The first REM cycle (周期) lasts about 10 minutes. As the night goes on, the REM cycle gets longer. By early morning, the REM cycle can last up to 90 minutes. Usually it is in this last REM cycle that we remember our dreams. Dreams change as people age. People may have several dreams each night. Some are like films and usually in color. They come to us over and over again. That may be because the dreamer is worrying about something and trying to find the answer. Sometimes we wake up with a good feeling from a dream. But often we can't remember the dreams clearly. It is reported that too much dreaming is bad for our health. The more we sleep, the longer we dream. The mind is hard at work. That is why we may have a long sleep and feel tired when we wake up. 根据短文内容判断下列句子正（T）、误（F）。 (     )1. We dream during the REM stage of sleep. (     )2. Children aged eight or nine have the same dreams as people aged thirty. (     )3. All the dreams are usually in color like films. (     )4. The longer we dream, the better we sleep. (     )5. Too much dreaming is bad for our health.